一种高精度高稳定性锯齿波振荡器的设计  

Design of a High Precision and High Stability Sawtooth Wave Oscillator

作　　者：邹伟[1] 吴蓉[1] 张伟娟[1] 

机构地区：[1]兰州交通大学电子与信息工程学院,甘肃兰州730070

出　　处：《电子质量》2011年第6期13-15,共3页Electronics Quality

基　　金：甘肃省科技支撑计划项目(097GKCA052)

摘　　要：设计了一种应用于DC/DC开关电源管理芯片的锯齿波振荡器,该电路利用内部基准电流源产生的电流对电容进行充放电,使得产生的锯齿波信号随电源电压和温度的变化较小,采用迟滞技术提高了锯齿波信号幅值。采用基于CSMC的0.5μmCMOS工艺进行仿真。结果表明,该电路产生的振荡频率为5MHz,信号幅值为0～3V,电源电压在2.7～5 V变化范围和温度在-20℃～120℃变化范围内产生的最大频偏为6%。该振荡器精度高、稳定性好,已经成功应用于一款DC/DC电源管理芯片中。A sawtooth wave oscillator which used in DC/DC switching power management chip was designed,in which reference current sources are used to charge and discharge capacitor.The generated Saw-tooth signal has little effected by power supply voltage and temperature.The hysteresis technology was adopted to improve the signal amplitude.The circuit was simulated based on 0.5μm CMOS process CSMC.Simulation results show that the circuit has a 5 MHz frequency and a 0～3V amplitude.The variation of oscillator frequency is 6% in the range of supply voltage of 2.7～5 V and temperature of-20℃～120℃.With a high precision and a high stability,the oscillator has already used in the design of a DC/DC switch power management chip successfully.

关 键 词：锯齿波振荡器 基准电流源 频率 

分 类 号：TN752[电子电信—电路与系统]